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    <style>
      .interval {
        margin-left: 20px;
      }
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  <title>Steamboat-反爬虫练习</title>
    <link href="css/jigsawCanvas.css" rel="stylesheet">
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	<nav class="navbar navbar-default navbar-fixed-top ">
			<div class="container-fluid">
			  <!-- Brand and toggle get grouped for better mobile display -->
			  <div class="navbar-header">
				<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
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				  <span class="icon-bar"></span>
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				<a class="navbar-brand" href="#">Steamboat</a>
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			  <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
				<ul class="nav navbar-nav">
				  <li class="active"><a href="#">滑动拼图验证码(Canvas) <span class="sr-only">(current)</span></a></li>
				</ul>
			  </div><!-- /.navbar-collapse -->
			</div><!-- /.container-fluid -->
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  </head>
  <body>
		
		<div class="jumbotron">
			<h1 class="interval">滑动拼图验证码(Canvas)</h1>
            <p class="interval">Canvas 将背景和缺口合并</p>
            <p class="interval">要将指定的缺块滑到缺口处，才能通过验证</p>
        </div>
        <div class='col-md-12'> 
          <div class='col-md-2'></div>
            <div class='col-md-8'>
              <form class="form-horizontal">
                <div class="form-group">
                    <label for="inputEmail3" class="col-sm-2 control-label">用户名：</label>
                    <div class="col-sm-4">
                    <input type="email" class="form-control" id="inputEmail3" placeholder="邮箱或手机号">
                    </div>
                </div>
                <div class="form-group">
                    <label for="inputPassword3" class="col-sm-2 control-label">密码：</label>
                    <div class="col-sm-4">
                    <input type="password" class="form-control" id="inputPassword3" placeholder="">
                    </div>
                </div>
                
                <div class="form-group">
                    <label for="inputPassword3" class="col-md-2 control-label"></label>
                    <div class="col-md-4">
                        <div class="jigsaw" id="jigsaw">
                            <div class="imagebox" id="imagebox">
                                <canvas width="350" height="287" id=jigsawCanvas></canvas>
                                <div class="missblock" id="missblock"></div>
                            </div>
                            <div class="jigsawTrack" id="jigsawTrack">
                                <span class="jigsawCircle" id="jigsawCircle"></span>
                                <span class="jigsawTips" id="jigsawTips">请滑动圆点以完成拼图</span>
                            </div>
                        </div>
                    </div>
                    </div>
                </div>

                </div>
              </form>
            </div>
            <div class='col-md-2'></div>
        </div>
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    <script src='js/jigsawCanvas.js'></script>
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